Filing card or loose leaf



- May 5,1939. F, THOMAS 2,039,752

FILING om: 0R LoosEULEAF Filed Jan. 19, 1954 F/GJ.

Patented May s, 1936 2,039,752 FILING CARD OR. LOOSE LEAF FrederickThomas, Philadelphia, Pa., assgnor to Keystone Index Card Company,

Philadelphia,

Pa., a corporation of Delaware Application January 19, 1934, Serial No.707,253

1 Claim.

' The principal object of the present invention is to strengthen themarginal portion of an index or filing card or, loose leaf, and moreparticularly that portion of the margin which bounds the perforationsprovided for binding or holdingl such leaves or cards. f

Another object of the invention is to accomplish the above resultwithout marring, or detracting from, the appearanceof the card or leaf,and 10 Without obscuring any printed data that may appear upon the same.

Other objects of the invention will appear from the followingdescription at the end of which the invention will be claimed.

Generally stated, the invention consists in a surface coating or varnishapplied to one edge of a loose leaf or index card and the bounding wallsof the perforations therein and to the border portion of each face ofthe card inward from said 20 edge.

The invention also consists in the improvements to be presentlydescribed and finally claimed.

In the following description reference will be made to the accompanyingdrawing forming part 25 hereof and in which,

Figure 1 is a face view of an index card embodying features of theinvention.

Figure 2 is a similar view of a loose leaf embodying features of theinvention, and

Figure 3 is a diagrammatic cross sectional view of the marginal part ofa leaf or card embodying features of the invention.

Referring to Figure 1, 3 represents a. filing card generally rectangularin outline and having a row 35 of perforations 4 spaced inward from itsedge 5. 6 represents a surface coating of transparent varnish applied tothe edge and to the bounding walls 1 of the perforations 4 and to theborder portion 8 of each face of the card inside of the edge 5.

The surface coating of varnish may be applied by dipping the cardedgewise to a suitable depth in a fluid bath of varnish which thereaftersets or dries on the card.

One example of a s table transparent varnish is as follows:

Grams 5 Cellulose acetate (dry) Acetone (fluid) 30 Dimethylphthalate(fluid) 1 This col1oida1 'solution may be mixed cold .or heated to about130 F. 1 The superficial coating of varnish protects the card fromtearing by strengthening its marginal portion and adjacent edges as wellas the wall which denes or bounds the perfor ations. 15

l The construction and operation 'if the modication shown in Figure 2are as above described, except as follows, 9 indicates a loose leaf andthe perforations I0 do not extend through to the edge of the leaf.

In this description and in the appended claim the word varnis is usedcomprehensively and includes lacquer, a plating of cellulose compound,natural or synthetic resin, latex, or Bakeliteh It will be obvious tothose skilled in the art to which the invention relatesthatmodificationsmay be made in details of construction and arrangement andin matters of mere form without departing from the spirit of theinvention which is not limited in respect to such matters or otherwisethan as the prior art, and the appended claim may require.

I claim:

A filing card or loose leaf, rectangular in outline and havingperforations spaced inward from one of its edges and provided throughits body, and having a coating of varnish applied to said edge and tothe bounding walls of the perforations and to the border portion of eachface inside said edge and confined to the surface, leaving theunderlying portion of the card or loose leaf in its original flexiblecondition.

- FREDERICK THOMAS.

